code: def p_error(self, p):
      raise ValueError("Failed to optimize the model.")
  
file_path: nnabla/python/src/nnabla/utils/converter/nnabla/opt_parser.py
imports: from ply import yacc
  from .opt_graph import Token
label_desc: Use image node_id 8 for calling the OptimizerParser obj's underlying member method code with example usage: obj.p_error(p) without return types